Fix CEC app

[nikhilwoodruff]

🤖 Generated by Copilot at 3e4efe0

Summary

🏛️🖥️🛠️

This pull request adds a new page to the PolicyEngine app for the Citizens' Economic Council project. It creates a new component CitizensEconomicCouncil that embeds the reform simulator app in an iframe.

To simulate reforms for the UK
A new component was added today
It renders an iframe
With the CitizensEconomicCouncil name
And imports the Header by the way

Walkthrough

• Add a new component CitizensEconomicCouncil to display the Citizens' Economic Council reform simulator app in an iframe (link)
• Import the CitizensEconomicCouncil component in the PolicyEngine component, which is the main entry point for the app (link)
• Create a new route /uk/cec in the PolicyEngine component, which renders the CitizensEconomicCouncil component as the page element (link)

[nikhilwoodruff]

Fixes #770